When compiling get error: 'QtGui/QAction' file not found #include <QtGui/QAction>

Question

I just installed Mac OS X 10.8.3 and Qt Creator 3, XCode, and XCode command line tools. I'm trying to compile a project that works on another computer but each time I go to "build all" I get error: 'QtGui/QAction' file not found in #include <QtGui/QAction>

I tried adding the second and third line in the .pro file but it didn't help

QT       += core gui opengl
CONFIG += qt
QT += gui
TARGET = BasicOpenGL
TEMPLATE = app

UPDATE: I also tried this .pro file and it didn't work

QT       += core gui opengl
QT += widgets
TARGET = BasicOpenGL
TEMPLATE = app

I should say this is my first time attempting development on mac.

Compile Output from Qt

Versions/A/Headers -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/System/Library/Frameworks/AGL.framework/Headers -I. -I. -F/Users/john/Qt/5.2.0/clang_64/lib -o mainwindow.o ../Framework/mainwindow.cpp
In file included from ../Framework/mainwindow.cpp:2:
../Framework/ui_mainwindow.h:14:10: fatal error: 'QtGui/QAction' file not found
#include <QtGui/QAction>
         ^
1 error generated.
make: *** [mainwindow.o] Error 1
15:51:32: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project BasicOpenGL (kit: Desktop Qt 5.2.0 clang 64bit)
When executing step 'Make'

UPDATE: I got it to work but with all the screwing around I'm not exactly sure what did it. I started with a fresh mac image, installed system updates, installed xcode, installed xcode command line tools, installed QT Creator 3.0, installed QT libraries 4.8.1, setup the compilers in QT Creator.

Answer 1

In Qt5, QAction header is in QtWidgets include sub-directory, not in QtGui (that's true for Qt4). Though you don't actually need to specify include sub-directories since qmake will handle that for you. You just need to add QT += widgets to your .pro file.

Answer 2

Try doing a make clean followed by a make. I had this exact problem on a Windows 7 system, and this is what worked for me.

Answer 3

Set the version to Qt5, change all #include<QtQui/*>s into #include<QtWidgets/*>. And add QT += widgets in your .pro file. Rebuild the project, when you get the error again, tap into the error message, and change the #include<QtQui/*>s into #include<QtWidgets/*> too.